For just over a pound in the pack, this premium-down bag kept testers warm into the mid-30s. “It puffed up like cotton candy as soon as I yanked it from the stuffsack,” reports one tester, who slept tentless in Arizona’s Havasu Canyon to enjoy the desert sky—and saw no dip in the Hightail’s loft due to nighttime dew. Credit plenty of 850-fill down and a shell made with Pertex Endurance fabric (on the footbox, hood, and collar), which lets interior moisture escape but repels rain, snow, and wind.

Our lightest and warmest two-season bag ever. Pertex Quantum® GL face fabric and lining combined with 850 Fill Power Goose Down provides maximum warmth to weight. Arid Zones with waterproof-breathable fabric at the head and foot protect against moisture in critical areas.

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-Premium 850 Fill power goose down -Arid Zones with waterproof-breathable fabric at the head and foot of the bag protect against condensation in critical areas -Pertex® Quantum GL nylon ripstop shell is water repellant yet breathable -Hood closure is optimized through use of stable cording and shock cord -Down insulated draft tube eliminates cold leaks through side zipper -Insulated draft collar prevents warm air from escaping -Full-length 2-way zipper for venting and mating of bags -Side zip features reversible slider tabs for ease of use from the inside and outside of the bag -Trapezoidal foot box design allows feet to rest in their natural position -Lightweight webbing on each side of zipper to prevent snags -Hang loops for drying and storing -Waterproof stuff sack and breathable cotton storage sack